Thanks for Smith's letter of 5 August [1801]. Classifying Linnaeus' lichens on new arrangement based on their fruits, for a new work; details of plan; requests lichen names from Smith. Sending Smith parcel of lichens via [Olof] Swartz; catalogue at end of letter [extant]. He has been expeanding his own herbarium, which now contains 7,000 species; requests Australasian and Pacific island plants from Smith; he has specimens of palms, American ferns, 'Epidendrum', and South American specimens. Asks Smith's opinion of Linnaeus' 'Byssum incanum', 'B. laceteum', 'B. antiquitatis', 'B. saxatilem', 'Lichen lacteum', and 'L. rupicolens'.

Catalogue of lichens, 2pp.